CNTs@T321微囊制备的纳米流体与砂轮磨削时的双重润滑增效机制

doi:10.3901/JME.2024.09.351

摘要/Abstract

摘要： 磨削时，由于砂轮气流屏障的作用，磨削液难以渗入磨削区发挥作用，导致传统的磨削液强化浇注、微量润滑等方法难以实现理想的润滑、冷却效果。为此，提出利用分子内部填充硫化异丁烯(T321)的碳纳米管(CNTs)微囊(CNTs@T321)为添加剂，分别制备微囊砂轮和纳米流体磨削液，磨削时纳米微囊可直接将润滑剂释放至磨削区域起自润滑作用。首先，制备纳米微囊并对其进行表征，然后制备以纳米微囊为添加剂的砂轮和纳米流体，开展了微量润滑条件下磨削GCr15钢的实验，揭示纳米微囊释放T321并生成自润滑膜的机制。结果表明，与传统砂轮及其磨削工艺比，微囊砂轮在纳米流体磨削条件下的磨削力、磨削温度、表面粗糙度值分别降低41%、37%、17%，而磨削比提高23%。磨削时，砂轮中的微囊可首先释放T321产生自润滑作用，纳米流体的介入进一步强化了磨削区的润滑和冷却作用，这种双重润滑增效机制提高了整个工艺系统的磨削性能。

关键词: 碳纳米管, 纳米微囊, 砂轮, 磨削液, 自润滑

Abstract: During the grinding process, the airflow barrier created by the grinding wheel can preventd the grinding fluid from infiltrating the grinding zone and exerting its effects. Therefore, traditional improvement methods such as intensified pouring of grinding fluid and minimum quantity lubrication (MQL) also struggle to achieve the ideal lubrication and cooling effects. To address this issue, the use of carbon nanotubes (CNTs) nano-capsules filled with T321 sulfurized isobutylene (CNTs@T321) as additives is proposed. Grinding wheels and nano-fluids filled with nano-capsules are then prepared separately. During grinding, the nano-capsules directly release the lubricant at the grinding interface, providing self-lubrication. First, the nano-capsules are prepared and characterized, followed by the preparation of grinding wheels and nano-fluids. Experiments are conducted under MQL conditions to grind GCr15 steel, and the mechanism of nano-capsule release of T321 and the formation of a self-lubricating film are revealed. The results show that compared to traditional grinding wheels and processes, the nano-capsule grinding wheel under nanofluids grinding conditions reduces grinding force, grinding temperature, and surface roughness values by 41%, 37%, and 17%, respectively, while improving the grinding ratio by 23%. The nano-capsules in the grinding wheel first release T321 to provide self-lubrication, and the intervention of the nanofluid further enhances lubrication and cooling in the grinding zone. It is this dual synergistic lubrication mechanism that improves the grinding performance of the process system.

Key words: CNTs, nano-capsules, grinding wheel, grinding fluids, lubrication mechanism

中图分类号:

TH162

关集俱, 祝正兵, 徐正亚, 栾志强, 许雪峰. CNTs@T321微囊制备的纳米流体与砂轮磨削时的双重润滑增效机制[J]. 机械工程学报, 2024, 60(9): 351-363.

GUAN Jiju, ZHU Zhengbing, XU Zhengya, LUAN Zhiqiang, XU Xuefeng. Dual Synergistic Lubrication Mechanism of Nano-fluid and Grinding Wheel Prepared by CNTs@T321 Nano-capsules[J]. Journal of Mechanical Engineering, 2024, 60(9): 351-363.

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